Device for sealing the penetration of drive shaft/housing in rotary pumps for liquids, especially oil pumps for motor vehicles
AssigneeGeneral Motors Corporation
InventorEkkehard Siegel
Life of this patent
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Abstract
A liquid pump has a drive shaft which extends through a housing. The high pressure side of the pump is connected through a radial channel with an annular channel formed in the housing surrounding the drive shaft. High pressure liquid in the annular channel prevents the ingesting of air by the pump.
Claims1
Device for sealing the penetration of drive shaft/housing to prevent aspiration of ambient air in rotary pumps for liquids, especially oil pumps with an inside gear with external teeth which is driven by a drive shaft and interacts with an internal gear ring surrounding it eccentrically, the gear and gear ring being located in a cylindrical recess of the pump housing, and wherein the axial mobility of the pump gears is bounded at least on one side by a housing cover having an opening for the penetration of the drive shaft characterized by the fact that an annular groove and a connecting channel are machined into the front face of the housing cover facing the inside gear and wherein said annular groove is surrounding the penetration for the drive shaft and serving as a sole hydraulic and only seal for the drive shaft penetration, and is connected with the pressure section of the pump by means of the channel.
Dependencies are inferred from the claim text.